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<TITLE>Command RR[N] - add the data recovery record</TITLE>
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<P class="title">Command <B>RR[N]</B> - add the data recovery record<hr></P>

<p><a href=""HELPArcRecovery.htm">Recovery record</a> is the data area,
optionally added to archive and containing error correction codes,
namely Reed-Solomon codes for RAR 5.0 archive format. While it increases
the archive size, it helps to recover archived files in case of disk failure
or data loss of other kind, provided that damage is not too severe.
Such recovery can be done with <a href="HELPCmdR.htm">"r" repair</a> command.
ZIP archive format does not support the recovery record.</p>

<p>Optional 'N' parameter defines the recovery record size as a percent
of archive size. If it is omitted, 3% is assumed. Maximum allowed recovery
record size is 1000%. Larger recovery records are processed slower both
when creating and repairing. Due to service data overhead, the actual
resulting recovery record size only approximately matches the user defined
percent and difference is larger for smaller archives.</p>

<p>In case of single continuous damage, typically it is possible to restore
slightly less data than recovery record size. Recoverable data size can be
lower for multiple damages.</p>

<p>If recovery record is partially broken, its remaining valid data still
can be utilized to repair files. Repair command does not fix broken blocks
in recovery record itself, only file data is corrected. After successful
archive repair, you may need to create a new recovery record for rescued
files.</p>

<p>While the recovery record improves chances to repair damaged archives,
it does not guarantee the successful recovery. Consider combining
the recovery record feature with making multiple archive copies to
different media for important data.</p>

<p>This command is the command line equivalent of <A HREF="HELPShellModes.htm">
archive management</A> command <A HREF="HELPCommandsProtect.htm">Protect
archive from damage</A>.</p>

<h1><B>Examples</B></h1>

<ol>
  <li> add the data recovery record of default 3% size to archive
    <I>backup</I></li>
</ol>
<blockquote>
  <p class="sample">WinRAR rr backup</p>
</blockquote>
<ol start="2">
  <li> add the data recovery record to archive <I>pictures</I>
    and set its size to 5% of total archive size</li>
</ol>
<blockquote>
  <p class="sample">WinRAR rr5p pictures</p>
</blockquote>
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